CN215756668U - Synchronous nitrification and denitrification biological denitrification reaction device - Google Patents
Synchronous nitrification and denitrification biological denitrification reaction device Download PDFInfo
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- CN215756668U CN215756668U CN202120383945.1U CN202120383945U CN215756668U CN 215756668 U CN215756668 U CN 215756668U CN 202120383945 U CN202120383945 U CN 202120383945U CN 215756668 U CN215756668 U CN 215756668U
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 72
- 230000001360 synchronised effect Effects 0.000 title claims abstract description 26
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 141
- 239000010802 sludge Substances 0.000 claims abstract description 43
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000000945 filler Substances 0.000 claims abstract description 17
- 239000001301 oxygen Substances 0.000 claims abstract description 17
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 17
- 239000007787 solid Substances 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 34
- 229910052757 nitrogen Inorganic materials 0.000 claims description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 230000001502 supplementing effect Effects 0.000 claims description 6
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 13
- 238000005273 aeration Methods 0.000 abstract description 12
- 239000007789 gas Substances 0.000 abstract description 8
- 238000005192 partition Methods 0.000 abstract description 2
- 239000002351 wastewater Substances 0.000 description 12
- 239000006185 dispersion Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 241000894006 Bacteria Species 0.000 description 3
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 description 3
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 3
- 238000006396 nitration reaction Methods 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 125000001477 organic nitrogen group Chemical group 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 238000005842 biochemical reaction Methods 0.000 description 1
- 239000003575 carbonaceous material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 230000033116 oxidation-reduction process Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000005191 phase separation Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000013316 zoning Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
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- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model discloses a synchronous nitrification and denitrification biological denitrification reaction device which comprises a reaction tank body, a multidirectional circulation vortex generator, a first guide cylinder, a second guide cylinder, a gas-liquid-solid three-phase separator and granular sludge carrier filler, wherein the multidirectional circulation vortex generator comprises a water inlet pipe, a spiral guide vane, a tangential guide vane and a gas-water mixing device, the top of the water inlet pipe is provided with a circulating water inlet and a gas inlet, the spiral guide vane is arranged on the outer wall of the water inlet pipe, the tangential guide vane is arranged between the first guide cylinder and the second guide cylinder, and the gas-water mixing device is arranged at the bottom of the water inlet pipe. The reaction device controls the concentration of dissolved oxygen in the reactor by the cooperation of the multi-directional circulating vortex generator and the gas-water mixing device with the partition aeration and the limited aeration, and realizes synchronous nitrification and denitrification by the cooperation of the gradient difference of the dissolved oxygen concentration of the inner layer and the outer layer of the carrier granular sludge, thereby effectively simplifying the flow of a denitrification system and reducing the process cost.
Description
Technical Field
The utility model relates to the field of wastewater treatment devices, in particular to a synchronous nitrification and denitrification biological denitrification reaction device.
Background
The nitrogen (including organic nitrogen, ammonia nitrogen and total nitrogen) in the wastewater is one of important pollutants in the wastewater and is a main substance causing eutrophication of an environmental water body, so that the removal of the nitrogen in the wastewater is one of main work contents of wastewater treatment. The traditional biological denitrification mode mainly comprises a nitrification/denitrification process, and is generally divided into three processes: the first step is to utilize sludge cultured in a biochemical reactor to remove COD and oxidize organic nitrogen into ammoniacal nitrogen at the same time, and the process is called as an oxidation reaction process; secondly, oxidizing ammonia nitrogen in the wastewater into nitrate nitrogen by nitrifying bacteria in the sludge under an aerobic condition, wherein the process is called a nitrification reaction process; and thirdly, reducing nitrate nitrogen in the wastewater into nitrogen by using denitrifying bacteria in the wastewater under the anoxic condition, and finally realizing the denitrification process of the wastewater denitrification.
At present, some new biological denitrification technologies, such as shortcut nitrification/denitrification, anaerobic ammonia oxidation and the like, exist; the denitrification technologies have strict requirements on reaction conditions, so that the system is very unstable, most of the denitrification technologies are in a test development stage, and the denitrification technologies are not industrially applied in China.
In the traditional nitrification/denitrification process (A/O process), the sludge concentration is generally 2500-3500 mg/L due to low sludge concentration, and the sludge concentration of the MBR process is only 6000-8000 mg/L; because the nitrification and denitrification have different requirements on dissolved oxygen (the nitrification reaction requires that the dissolved oxygen is more than or equal to 2mg/L, and the denitrification reaction requires that the dissolved oxygen is less than or equal to 0.5mg/L), the nitrification reaction and the denitrification reaction need to be respectively placed in two reaction tanks for carrying out, and aerobic and anoxic environments are respectively provided for the biochemical reaction, so that the reaction tanks have larger volume and lower efficiency.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a synchronous nitrification and denitrification biological denitrification reaction device, which solves the problems in the prior art, enables waste water to synchronously complete nitrification and denitrification reaction in the same reaction tank, effectively simplifies the flow of a denitrification system and reduces the cost.
In order to achieve the purpose, the utility model provides the following scheme:
the utility model provides a synchronous nitrification and denitrification biological denitrification reaction device which comprises a reaction tank body, a multidirectional circulation vortex generator, a first guide cylinder, a second guide cylinder, a gas-liquid-solid three-phase separator and granular sludge carrier filler, wherein the multidirectional circulation vortex generator is arranged in the reaction tank body and protrudes out of a top plate of the reaction tank body;
the multidirectional circulation vortex generator comprises a water inlet pipe, a spiral flow deflector, a tangential flow deflector and a gas-water mixing device, wherein a circulating water inlet and an air inlet are formed in the top of the water inlet pipe, the spiral flow deflector is arranged on the outer wall of the water inlet pipe, the tangential flow deflector is arranged between a first flow guide cylinder and a second flow guide cylinder, and the gas-water mixing device is arranged at the bottom of the water inlet pipe.
Preferably, a circulating water inlet and a circulating water inlet at the top of the water inlet and inlet pipe are both arranged outside the reaction tank body, and a circulating water inlet opening and closing pipeline and a circulating pump are communicated with a water outlet pipe of the gas-liquid-solid three-phase separator;
preferably, the spiral guide vane arranged on the outer wall of the water inlet and air inlet pipe is higher than the top of the second guide cylinder and lower than the top of the first guide cylinder, the tangential guide vane is arranged at the bottom of the first guide cylinder, the bottom of the second guide cylinder is abutted against the bottom of the reaction tank body, and the bottom of the second guide cylinder is provided with a circumferential annular water inlet;
preferably, the gas-water mixing device comprises a dispersion disc, a flow guide disc and a reflecting disc, the dispersion disc is an annular dispersion disc, the dispersion disc is arranged at the bottom of the water inlet pipe, the flow guide disc is a plurality of arc-shaped flow guide sheets which are uniformly arranged in the circumferential direction, the plurality of arc-shaped flow guide sheets are vertically arranged at the lower part of a circular ring of the dispersion disc, the reflecting disc is arranged in the flow guide disc, and an arc groove is formed in the upper part of the reflecting disc along the annular shape;
preferably, a water outlet is formed in the center of the bottom of the water inlet air pipe, a plurality of air outlet holes are uniformly formed in the periphery of the water outlet, the water outlet is formed in the upper portion of the center of the reflecting disc, and the air outlet holes are formed in the upper portion of the annular arc groove of the reflecting disc;
preferably, the arc-shaped guide vane of the guide disc and the spiral guide vane have the same rotation direction;
preferably, the bottom of the first guide cylinder is higher than the bottom of the water inlet and air inlet pipe, and the top of the first guide cylinder is connected with the top plate of the reaction tank body;
preferably, an air inlet of the water inlet air inlet pipe is communicated with an air blower through a pipeline, and valves are directly arranged on the pipeline of the air blower and the pipeline of the air inlet;
preferably, the water inlet pipe of the reaction tank body is also respectively communicated with a carbon source supplementing device and an alkalinity supplementing device through pipelines;
preferably, a dissolved oxygen sensor is arranged between the water inlet pipe and the second guide cylinder, and an ORP detector is arranged between the reaction tank body and the second guide cylinder.
Compared with the prior art, the utility model has the following technical effects:
1. the reaction device controls the concentration of dissolved oxygen in the reactor by taking the measures of zoning aeration and limiting aeration, and provides good conditions for synchronous nitrification and denitrification by matching with the gradient difference of the dissolved oxygen concentration of the inner layer and the outer layer of the carrier granular sludge, and two relatively independent biochemical reactors do not need to be built for nitrification and denitrification reactions, so that the flow of a denitrification system can be effectively simplified, and the process cost is reduced.
2. The reaction device of the utility model adopts the cooperation of the multidirectional circulation vortex generator and the gas-water mixing device to reduce the gas-water mixing density of water flow in the generator and generate gas effect, so that the water flow forms lifting and rotating water flow inside and outside the generator, the water flow is collected at the bottom and the center of the reactor after rotating and flowing out of the reactor and rises in the guide cylinder of the vortex generator to form multi-direction and multi-dimension water flow circulation, the circulation flow is tens of times of the inflow flow, and the microbial flora can effectively bear the impact of water quality fluctuation.
3. The utility model adopts carrier granular sludge, has high sludge concentration and compact structure, can greatly reduce the occupied area under the same treatment condition, and can be widely applied to the fields of high-nitrogen-containing wastewater treatment such as garbage leachate treatment, kitchen biogas slurry treatment and the like.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural diagram of a synchronous nitrification-denitrification biological denitrification reaction device;
FIG. 2 is a schematic structural diagram of a multi-directional circulation vortex generator of the synchronous nitrification-denitrification biological denitrification reaction device;
FIG. 3 is a schematic structural view of a gas-water mixing device of the multi-directional circulation vortex generator;
FIG. 4 is a bottom view of a diffuser plate of the air-water mixing device;
the system comprises a reaction tank body 1, a multidirectional circulating vortex generator 2, a water inlet pipe 21, a spiral flow deflector 22, a first flow guide cylinder 23, a tangential flow guide plate 24, a second flow guide cylinder 25, an air outlet 26, a water outlet 27, a gas-liquid-solid three-phase separator 3, a granular sludge carrier filler 4, a alkalinity supplementing device 5, a carbon source supplementing device 6, a blower 7, a circulating pump 8, a gas-water mixing device 9, a flow dispersing disc 91, an arc flow deflector 92 and a reflecting disc 93.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide a synchronous nitrification and denitrification biological denitrification reaction device, which solves the problems in the prior art, enables waste water to synchronously complete nitrification and denitrification reaction in the same reaction tank, effectively simplifies the flow of a denitrification system and reduces the cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Example one
As shown in fig. 1-4, the present embodiment provides a synchronous nitrification and denitrification biological denitrification reaction apparatus, which enables wastewater to synchronously complete nitrification and denitrification reactions in the same reaction tank, and the reaction apparatus of the present embodiment includes a reaction tank 1, a multidirectional circulation vortex generator 2, a first guide cylinder 23, a second guide cylinder 25, a gas-liquid-solid three-phase separator 3 and a granular sludge carrier filler 4. Specifically, the multidirectional circulation vortex generator 2 is vertically arranged at the middle upper part of the reaction tank body 1, a second guide cylinder 25 and a first guide cylinder 23 are sequentially sleeved outside the multidirectional circulation vortex generator 2, the axes of the multidirectional circulation vortex generator 2, the first guide cylinder 23 and the second guide cylinder 25 are on the same vertical straight line, a water circulation annular space is arranged between the multidirectional circulation vortex generator 2 and the second guide cylinder 25, a water circulation annular space is also arranged between the second guide cylinder 25 and the first guide cylinder 23, the bottom of the second guide cylinder 25 is arranged at the bottom of the reaction tank body 1, an annular water inlet is arranged at the bottom of the second guide cylinder 25 along the circumferential direction, the top of the second guide cylinder 25 is lower than the top of the multidirectional circulation vortex generator 2 and the first guide cylinder 23, the bottom of the first guide cylinder 23 is higher than the bottom of the multidirectional circulation vortex generator 2, the top of the first guide cylinder 23 is connected with the top plate of the reaction tank body 1; the arrangement is that in order to provide a water circulation space between the first guide cylinder 23 and the second guide cylinder 25 for water ascending between the multidirectional circulation vortex generator 2 and the second guide cylinder 25 to flow into through the top of the second guide cylinder 25, a tangential guide plate 24 is arranged between the bottom of the second guide cylinder 25 and the outer wall of the second guide cylinder 25, so that the flowing water can flow along the outer part of the first guide cylinder 23 along the anticlockwise direction, and further, water flow between the first guide cylinder 23 and the reaction tank body 1 rotates anticlockwise to enter the first guide cylinder 23 through the annular water inlet at the bottom of the first guide cylinder 23 to perform reciprocating circulation.
In this embodiment, the granular sludge carrier filler 4 with a large number of capillary micropores is adopted for synchronous nitrification/denitrification, the granular sludge carrier filler 4 is filled in the reaction tank body 1, specifically, the height of the granular sludge carrier filler 4 filled outside the first guide cylinder 23 is not higher than the tangential guide plate 24 at the bottom of the second guide cylinder 25, and the granular sludge carrier filler 4 filled inside the first guide cylinder 23 is higher than the tangential guide plate 24 and is not higher than the top of the first guide cylinder 23; the granular sludge carrier filler 4 enables microorganisms to be attached to the surface of carrier particles and even go deep into the carrier to grow and continuously proliferate, and finally forms the high-concentration granular sludge carrier filler 4 depending on the carrier in the reactor through the processes of continuous culture, elimination and domestication; the section of the granular sludge is respectively a carrier, an anoxic sludge layer and an aerobic sludge layer from inside to outside, and because dissolved oxygen in water is oxidized and consumed by nitration reaction on the outer layer of the granular sludge, the inner layer and the carrier part of the granular sludge are in an anoxic state, nitrate nitrogen generated by the outer layer sludge through nitration reaction can be reduced into nitrogen through denitrifying bacteria on the inner layer, the aim of biological denitrification is fulfilled, and the reaction process of synchronous nitration and denitrification is realized on the macroscopic scale of the reactor.
The granular sludge carrier filler 4 of the embodiment is a carbon-based material particle which is similar to activated carbon and has a well-developed capillary micropore structure, has a large specific surface area, and is very beneficial to the attachment and growth of microorganisms; the density of the granular sludge which grows well is greater than that of water, so that the sedimentation performance is good; the filling quantity of the granular sludge carrier filler 4 can reach 0.5-1.5%, so that higher sludge concentration and good sludge settling performance can be provided; through detection, the highest sludge concentration can reach 30,000-40,000 mg/L, which is 8-10 times of that of the traditional activated sludge system, so that the volume of the reactor can be greatly reduced.
In the embodiment, the multi-directional circulation vortex generator 2, the first guide cylinder 23, the second guide cylinder 25, the gas-liquid-solid three-phase separator 3 and the tangential guide plate 24 are arranged to realize the partition aeration and the limited aeration, an aeration area is arranged between the multi-directional circulation vortex generator 2 and the first guide cylinder 23, and a limited aeration area is arranged outside the first guide cylinder 23, so that the total dissolved oxygen concentration in the reactor is effectively controlled, and the sludge is repeatedly subjected to aerobic and anoxic environments through continuous reciprocating circulation of mixed liquid in the reactor, thereby being beneficial to the implementation of nitrification reaction and denitrification reaction.
As shown in fig. 1 and 2, the aeration zone of the present embodiment is mainly realized by a multidirectional circulation vortex generator 2, the multidirectional circulation vortex generator 2 includes a water inlet pipe 21, a spiral baffle 22, a tangential baffle 24 and an air-water mixing device 9, the top of the water inlet pipe 21 is provided with a circulation water inlet and an air inlet, the spiral baffle 22 is arranged on the outer wall of the water inlet pipe 21, the tangential baffle 24 is arranged between a first draft tube 23 and a second draft tube 25, and the air-water mixing device 9 is arranged at the bottom of the water inlet pipe 21; the gas-liquid-solid three-phase separator 3 is arranged in a top plate of the reaction tank body 1, a circulating water inlet and a circulating water inlet at the top of a water inlet pipe 21 are both arranged outside the reaction tank body 1, a circulating water inlet opening and closing pipeline and a circulating pump 8 are communicated with a water outlet pipe of the gas-liquid-solid three-phase separator 3, the gas-liquid-solid three-phase separator 3 discharges a part of separated water, and a part of separated water is sent back to the circulating water inlet through the circulating pump 8 to be subjected to secondary circulation to enter a gas-water mixing device 9; the air inlet of the water inlet air pipe 21 is communicated with the air blower 7 through a pipeline, the pipelines of the air blower 7 and the air inlet are directly provided with valves, after the air blower 7 sends air into the inlet, the air finally reaches the air-water mixing device 9 through the water inlet air pipe 21, and the air and the water are exposed and tangentially rotate and circulate.
As shown in fig. 2, the spiral guide vane 22 disposed on the outer wall of the inlet pipe 21 of this embodiment is higher than the top of the second guide cylinder 25 and lower than the top of the first guide cylinder 23, the tangential guide vane 24 is disposed at the bottom of the first guide cylinder 23, the bottom of the second guide cylinder 25 abuts against the bottom of the reaction tank 1, the bottom of the second guide cylinder 25 is provided with a circumferential annular water inlet, the spiral guide vane 22 rotates counterclockwise, the spiral guide vane 22 functions to allow the rotating water flow to rise upward through the spiral guide vane 22 and then flow into the circulation space between the first guide cylinder 23 and the second guide cylinder 25, and then flow into the space between the second guide cylinder 25 and the reaction tank 1 counterclockwise, so as to achieve a reciprocating circulation, and thus enable the granular sludge carrier filler 4 to better perform nitrification and denitrification on the wastewater.
As shown in fig. 3-4, in order to realize water circulation, the air-water mixing device 9 of this embodiment includes a diffuser plate 91, a flow guiding plate and a reflecting plate 93, the diffuser plate 91 is an annular diffuser plate 91, the annular diffuser plate 91 is disposed at the bottom of the water inlet pipe 21, the middle circular space of the diffuser plate 91 is the same as the bottom of the water inlet pipe 21, here, the diffuser plate 91 seals the bottom of the water inlet pipe 21, and the bottom of the water inlet pipe 21 is provided with a water outlet 27 and an air outlet 26, although except for the method of this embodiment, the water outlet 27 and the air outlet 26 can be directly opened at the bottom of the water inlet pipe 21; the flow guide disc is provided with a plurality of arc-shaped flow guide sheets 92 which are uniformly arranged in the circumferential direction, the arc-shaped flow guide sheets 92 are vertically arranged at the lower part of the circular ring of the flow distribution disc 91, the rotation direction of the arc-shaped flow guide sheets 92 of the flow guide disc is the same as that of the spiral flow guide sheet 22, the reflecting disc 93 is arranged in the circular ring of the circular flow guide disc, and the upper part of the reflecting disc 93 is provided with a circular arc groove along the circular ring; the center of the bottom of the water inlet pipe 21 of the embodiment is provided with a water outlet 27, 8 air outlet holes 26 are uniformly arranged around the water outlet 27, the water outlet 27 is arranged at the upper part of the center of the reflecting disc 93, and the air outlet holes 26 are arranged at the upper part of the annular arc groove of the reflecting disc 93; after the circulating water and the gas at the bottom of the water inlet and inlet pipe 21 come out, the circulating water flows out through the water outlet 27 and then flows out through the middle part of the reflecting disc 93 along the tangential transverse line of the arc-shaped groove, the gas of the gas outlet 26 meets the bottom of the arc-shaped groove and flows out along the outer side in a mixing way, the gas flows out and reversely flows out through the guide plate and rises upwards through the spiral guide plate 22 outside the water inlet and inlet pipe 21, because the return water passing through the gas-water mixing device 9 is mixed with a large amount of bubbles, the density of the return water is less than the water density outside the first guide cylinder 23 due to strong aeration, thereby forming a gas stripping effect, reducing the local pressure, driving the surrounding water or fluid flow by the fluid pressure, enabling the water outside the guide cylinder to continuously enter the bottom and the center of the first guide cylinder 23 from the lower part of the first guide cylinder and gather and move upwards, and forming a continuous circulating effect of water flow rising and falling inwards, therefore, multi-direction and multi-dimension water flow circulation is formed, the circulation flow is tens of times of the inflow flow, the microbial flora can effectively bear the impact of water quality fluctuation, and even if nitrogen bubbles generated by denitrification are contained in the granular sludge carrier filler 4, the granular sludge carrier filler cannot float upwards on the water surface to influence the quality of the discharged water.
As shown in fig. 1, the water inlet pipe of the reactor tank 1 of the present embodiment is further respectively communicated with a carbon source supplement device 6 and an alkalinity supplement device 5 through pipelines, a dissolved oxygen sensor is arranged between the water inlet pipe 21 and the second draft tube 25, an ORP detector is arranged between the reactor tank 1 and the second draft tube 25, the ORP detector is an Oxidation Reduction Potential (ORP) sensor, the dissolved oxygen state of the reactor is monitored through the dissolved oxygen sensor and the ORP detector, and the air volume of the blower 7 can be controlled through frequency conversion at any time, so that the dissolved oxygen in the reactor is controlled to be in an optimal state.
The working process of the synchronous nitrification and denitrification biological denitrification reaction device of the embodiment is as follows:
firstly, the circulating water pumped back by the circulating pump 8 changes the direction of water flow under the action of the reflecting disc 93 of the air-water mixing device 9, the water flow is changed from vertical downward to horizontal peripheral diffusion, after the low-pressure compressed air of the blower 7 is discharged through the air outlet holes 26 around the water outlet 27, the low-pressure compressed air is mixed with the peripheral diffusion water flow and is sheared into small bubbles by the water flow, the small bubbles are continuously diffused to the periphery along the flow dispersion disc 91, and the water flow forms horizontal rotation under the action of the guide plate on the lower disc surface of the flow dispersion disc 91.
Secondly, as the return water is mixed with a large amount of bubbles, the density of the bubbles is less than the density of the water outside the first guide cylinder 23, so that a gas stripping effect is formed, the water outside the first guide cylinder 23 can continuously enter the guide cylinder from the lower part of the first guide cylinder 23 and move upwards, and a continuous circulating effect of internal rising and external falling of water flow is formed.
Finally, when the water flow rises and falls in the vertical direction, the water flow forms rotation in the horizontal direction due to the first deflection of the guide plate on the dispersion plate 91, the second deflection of the spiral guide plate 22 and the third deflection of the tangential guide plate 24 at the outlet of the first guide cylinder 23; when the rivers are at the horizontal rotation, because of the inner wall of retort body 1 can produce frictional resistance, rivers can produce the downward motion, further make the granule mud carrier filler 4 of aquatic under rivers endless dual function, to the bottom and the center gathering of retort body 1 to it is reciprocating to circulate constantly, has guaranteed the intensive mixing of intaking with circulation rivers, carrier granule mud.
The utility model adopts carrier granular sludge, can greatly improve the sludge concentration, the total sludge concentration in the reactor is 8-10 times of that of the traditional activated sludge system, can greatly improve the treatment load, and can bear the wastewater of high-concentration ammonia nitrogen and total nitrogen; meanwhile, the good sedimentation performance of the sludge is ensured, and the gas-liquid-solid three-phase separation efficiency is improved.
The utility model controls the concentration of dissolved oxygen in the reactor by taking the measures of zone aeration and limited aeration, and provides good conditions for synchronous nitrification and denitrification by matching with the gradient difference of the dissolved oxygen concentration of the inner layer and the outer layer of the carrier granular sludge, and two relatively independent biochemical reactors do not need to be built for nitrification and denitrification reactions, thereby effectively simplifying the flow of a denitrification system and reducing the construction cost.
The principle and the implementation mode of the utility model are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the utility model; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (10)
1. The utility model provides a synchronous nitrification denitrification biological denitrification reaction unit which characterized in that: the reactor comprises a reaction tank body, a multidirectional circulation vortex generator, a first guide cylinder, a second guide cylinder, a gas-liquid-solid three-phase separator and granular sludge carrier filler, wherein the multidirectional circulation vortex generator is arranged in the reaction tank body and protrudes out of a top plate of the reaction tank body;
the multidirectional circulation vortex generator comprises a water inlet pipe, a spiral flow deflector, a tangential flow deflector and a gas-water mixing device, wherein a circulating water inlet and an air inlet are formed in the top of the water inlet pipe, the spiral flow deflector is arranged on the outer wall of the water inlet pipe, the tangential flow deflector is arranged between a first flow guide cylinder and a second flow guide cylinder, and the gas-water mixing device is arranged at the bottom of the water inlet pipe.
2. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: and a circulating water inlet and an air inlet at the top of the water inlet air pipe are arranged outside the reaction tank body, and a circulating water inlet opening and closing pipeline and a circulating pump are communicated with a water outlet pipe of the gas-liquid-solid three-phase separator.
3. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: the spiral guide vane that the inlet air pipe outer wall set up is higher than the top of second draft tube and is less than the top of first draft tube, the tangential guide plate sets up the bottom of first draft tube, the bottom of second draft tube with retort body bottom offsets, the bottom of second draft tube is provided with the annular water inlet of circumference.
4. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: the air-water mixing device comprises a diffusing disc, a flow guide disc and a reflecting disc, wherein the diffusing disc is an annular diffusing disc, the diffusing disc is arranged at the bottom of the water inlet pipe, the flow guide disc is arc-shaped flow guide sheets which are uniformly arranged in a plurality of circumferential directions and is a plurality of arc-shaped flow guide sheets which are vertically arranged at the lower part of a ring of the diffusing disc, the reflecting disc is arranged in the flow guide disc, and the upper part of the reflecting disc is provided with an arc groove along the annular direction.
5. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 4, wherein: the bottom center of intake pipe is provided with the delivery port, evenly be provided with a plurality of ventholes around the delivery port, the delivery port sets up the central upper portion of reflecting disc, the venthole sets up the upper portion in reflecting disc annular circular arc groove.
6. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 4, wherein: the arc-shaped guide vane of the guide disc and the spiral guide vane have the same rotating direction.
7. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 3, wherein: the bottom of the first guide cylinder is higher than the bottom of the water inlet and inlet pipe, and the top of the first guide cylinder is connected with the top plate of the reaction tank body.
8. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: the air inlet of the water inlet air inlet pipe is communicated with the air blower through a pipeline, and the air blower and the pipeline of the air inlet are directly provided with valves.
9. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: the water inlet pipe of the reaction tank body is also respectively communicated with a carbon source supplementing device and an alkalinity supplementing device through pipelines.
10. The synchronous nitrification-denitrification biological nitrogen removal reaction device according to claim 1, wherein: and a dissolved oxygen sensor is arranged between the water inlet pipe and the second guide cylinder, and an ORP detector is arranged between the reaction tank body and the second guide cylinder.
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